We developed an optimization-type energy model named ROSE (Refuse Option for Supplying Energy) to evaluate the energy-use technologies of the refuse in the city. ROSE is applied to the 23 wards in Tokyo. We evaluate the future potentials of the conventional refuse power generation, the large-scale refuse power generation and the RDF power generation from the views of cost and CO2 emission reduction.Without increasing system cost, CO2 emission can be reduced by refuse energy systems (refuse power generation, RDF power generation). When the large-scale refuse power generation system was assumed to be available, the system cost could be reduced largely. RDF power generation was introduced in case of the CO2 emission was limited.